In this guide
Binaural audio uses separate signals for the left and right ears to convey spatial cues. It can be captured with microphones at a head or created by rendering spatial audio for headphones. Preserve the stereo pair and compare the result on headphones when editing.
Binaural audio is audio designed to deliver different signals to your left and right ears so you can perceive a sense of direction and space. A binaural recording can use two microphones positioned at the ears of a person or a head-shaped microphone. Spatial audio can also be rendered into a binaural headphone mix using processing that models how sound reaches each ear.
Headphones are a common way to listen because each ear receives its intended channel with less sound crossing over from the other side. The impression varies with the recording, headphones and listener. Neumann's binaural microphone description illustrates a two-channel dummy-head recording, while a BBC research note explains headphone playback and spatial cues.
How does binaural audio create a sense of space?
A sound approaching from one side typically reaches the nearer ear at a different time and level than the farther ear. The head, torso and outer ears also shape sound differently depending on its direction. These differences are among the cues the hearing system uses to locate a source. A binaural recording captures some of them at a particular recording position; a binaural renderer estimates them for virtual sources.
An HRTF, or head-related transfer function, describes how sound from a particular direction is filtered on its way to the ears. People have different anatomy, so a generic rendering or a dummy head may suit some listeners better than others. A research study on HRTF individualization discusses differences in perceived location and coloration. Static recordings also do not automatically change the scene when a listener turns their head.
Binaural vs. stereo vs. surround sound
| Term | What it describes | Listening implication |
|---|---|---|
| Stereo | Two audio channels, usually left and right. | Channels can contain different sound; a stereo file is not necessarily a binaural recording. |
| Binaural | Two ear-specific signals with spatial cues, captured or rendered for the ears. | Headphones deliver the channels separately; perceived direction varies by listener and mix. |
| Channel-based surround | A mix using additional channels, such as a conventional 5.1 layout. | It can feed multiple speaker positions or be rendered for another playback system. |
A binaural recording is usually stored as two-channel audio, but two channels alone do not establish how it was made. For more on channel layouts, see mono vs. stereo and what surround sound is.
How to listen to binaural audio
- Use headphones or earphones and start at a comfortable volume. Check the left and right markings; the left/right audio test can help verify which side plays.
- Play a known binaural example and listen for movement, distance or direction. Effects depend on the source and your ears; some sounds may seem inside the head or their direction may be ambiguous.
- If it sounds reversed or collapsed, check the file and player settings, headphone orientation and any mono accessibility setting. Try disabling optional spatial processing for a comparison; double processing can change the intended presentation.
- Compare on speakers if that is another delivery destination, but expect a different presentation: sound from each speaker reaches both ears. Compatibility varies with the recording and reproduction method.
How is binaural audio recorded or made?
A binaural microphone places a capsule at or near each ear, sometimes using a dummy head with artificial ears. Put it where you want the listener's perspective, set safe input levels and record a short test with a sound moving around it. The room and microphone position become part of that perspective; moving the microphone or changing the room changes the result.
An editor can also render a multichannel or object-based spatial mix to a two-channel binaural output. The exact settings and available monitoring modes depend on the software and renderer. Check the output on headphones, keep the original project and make a separate export for each required format.
How to edit a binaural recording without losing its spatial cues
- Keep the stereo original. Confirm left and right channels are present and have not been swapped. Preserve the source file and a copy of the project.
- Keep both channels aligned. Trim the stereo pair together and check the start and end. Moving one side independently, summing to mono or applying different processing can change spatial cues.
- Preview the actual export. Listen on headphones to stationary and moving sounds. Confirm the channel order and check the result again in the destination player.
The channel splitter can inspect the two sides of a supported short stereo MP3 or WAV, but splitting them creates separate mono files; it is not a binaural renderer or a source-separation tool. Its browser output is decoded at 48 kHz and exported as 16-bit PCM WAV or newly encoded MP3, so keep the original pair and check timing before recombining anything. Use a stereo-capable editor for the final binaural mix.
Is binaural audio the same as binaural beats?
No. Binaural audio often refers to spatial recording or headphone rendering. Binaural beats refers to a different perceptual phenomenon involving slightly different tones presented separately to each ear. A spatial recording does not need those tones, and a binaural-beat track is not necessarily a spatial recording.
Common questions
Do I need special headphones?
Ordinary stereo headphones can play a two-channel binaural file. Headphone response, channel order and individual hearing influence the experience; follow the requirements of any particular spatial-audio service.
Is all stereo audio binaural?
No. Stereo means two channels. Binaural audio uses ear-specific cues intended to convey spatial direction; an ordinary stereo mix may use different recording or panning techniques.
Can I convert binaural audio to mono?
You can make a mono copy in a suitable editor, but combining the ear signals changes the spatial cues and can cause cancellation. Keep the stereo original and listen to the mono result before delivery.
Does binaural audio require a dummy-head microphone?
No. A dummy head is one way to capture it; binaural rendering can also produce ear-specific signals from a spatial mix. The workflow and result depend on the source and renderer.